NEET Biology question
A man with normal vision whose father was colourblind marries with women whose father was also colourblind. Suppose their first child is daughter then what are the chances of this child to be colourblind?
Answer: (D)
Solution
The man has normal vision, so despite his father being colourblind, the man himself must carry only the normal allele on his single X chromosome (); the woman, whose father was colourblind, must be an obligate carrier (), having received her father's allele. Crossing (father)
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